China and Russia don't want to hurt N. Korea too bad because they are technically allies, but even moreso, they don't want a new, Western Friendly North Korea on their doorstep. The best (of all terrible solutions) that I see is ousting the current gov't, then letting China help put a new gov't in place there. Hopefully that would keep China and Russia happy, and Japan, S. Korea, and the US could all breath easier knowing there isn't a psychotic threatening to nuke them.
It's also going to take a multi nation humanitarian effort - people in N. Korea are already starving, and it will only get worse if there is an attack.
But I don't know all the details, and I'm sure this isn't all that great of a plan, either.
Owner of PS4 Pro, Xbox One, Switch, PS Vita, and 3DS